Precautions for initial start on an OLD crate engine

[clean8485]

I have an old GM 350 SBC crate engine that I picked up a few years ago. Its a 300HP version that was produced in the late 1990s. It has never been installed, and never been run. Are there any precautions that I should take before installing it? I was thinking about using a tool to turn the oil pump and pre-lube the engine, and putting some oil into the cylinders before I attempt to turn the crank. Is there any reason for concern regarding the front and rear crankshaft seals on this engine? Its at least 25 years old, and as I said, its never been run. Thanks in advance.